Insulator



June 27, 1933. s. D. SPRONG 1,915,838

INSULATOR Filed March 1, 1929 3 Sheetg-Sheet l avwemtoz I JEVE/P/vfi. J /ro/va GHQ M401 4 M k m S. D. SPRONG June 27, 1933.

IN SULAI'OR Filed March 1, 1929 3 Sheets-Sheet 2 June 27, 1933. s, D, SPRQNG 1,915,838

INSULATOR Filed March 1, 1929 3 Sheets-Sheet 5 Patented June 27, 1933 UNITED STATES PATENT OFFICE SEVERN D. SPRONG, OF BROOKLYN, NEW YORK, ASSIGNOR TO ENGINEERING PRODUCTS CORPORATION, INQ, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK INSULATOR Application filed larch 1,

This invention relates to improvements in insulators and aims to provide improyed supporting means therefor. and also 1mproved means for securing conductors to insulators.

T lain, glass and molded insulators the means for supporting the insulator usually includes a metal fitting having a portion sc'rewed or otherwise secured to a fixed support such fitting usually being provided with a projecting J part extending into a cavity formed in the body of insulating material. Frequently a layer of cement or lead is interposed between the body of insulating material and the supporting fitting.

In the prior types of insulators the conductor carriers are also frequently formed with metallic fittings having shanks fitting 1n cavities formed in the insulator body.

In practice the insulators having conductor carriers and insulator holding means with parts which are seated in cavities in the insulator body have an inherent weakness because any force tending to pull the insulator sideways develops an internal strain tending to split the body of porcelains, glass or molded material of which the insulator is formed. To offset this inherent weakness 1n design the former insulators have been made unusually large in order to resist the tendency to fracture.

My present invention aims to overcome the faults found in the prior types of insulators. To these ends I provide an insulator in which the holding means compressively engages an exterior portion of the insulator. I also provide a conductor carrier which has a portion which compressivelyengages an exterior part of the insulator body. In my improved insulator there are no fittings or supports which extend into cavities formed in the insulator thus there is no weakening of the structure thereof. My invention provides an insulator of smaller size and greater strength as com pared with the insulators heretofore in general use.

1929. Serial N0. 843,621.

The invention will be fully apparent from the following specification when read in connection with the accompanying drawings and the novel features will be defined with particularity in the appended claims.

In the drawings:

Fig. 1 is a vertical longitudinal section through an insulator and its holding and supporting means embodying my invention;

Fig. 2 is a horizontal section on'line 2-2 of Fig. 1;

Fig. 3 is a longitudinal section illustrating an alternative embodiment of the invention;

Fig. 4 is an inverted plan of the insulator body shown in Fig. 3; t Fig. 5 is a perspective detail view of a holdlng member shown in Fig. 3;

Fig. 6 is a longitudinal section showing a slight modification of the structure illustrated in Fig. 3;

Referring in detail to the drawings, 10 represents a suitable fixed support. This carries on its upper surface a plurality of members 12 having upwardly extending jaws 14. These jaws are fluted on their interior, as indicated at 16, for interengagement with fluted portions 18 formed on the lower part 20 of an insulator body 22. In some cases the fluted portions 16 of the jaws 14 may have secured thereto a film or thin coating of lead 24 adapted to compensate for inequalities in the surface of the insulator body or to permit of slight compressibility.

The exterior of each jaw 14 is provided with a tapered or substantially conical porfor supporting a conductor 42. This carrier 40 includes a number of jaws 44, a ring 46 having a tapered bore 48 and clamping bolts-50 for compressibly securing the carrier to the upper portion of the insulator body 22. The jaws 44 and the ring 46 are of substantially the same construction as the parts 12 and 28 which form the holding means which secure the insulating body to the support 10.

In the alternative embodiment of the invention shown in Fig. 3 I provide an insulator body 52 having a number of exterior projections 54 located at equally spaced intervals around the periphery of the lower part of the insulator body these projections being separated by interrupted parts 56. The projections 54 are fluted as indicated at 58 for interengagement with fluted portions 60 formed on jaws 62 which project upwardly from a base member 64. The exterior of each jaw 62 is tapered and screw threaded as in dicated at 66 in F ig. 3. The ring 68 when screwed down, by means of a-spanner wrench or similar tool, will force the jaws 62 into engagement with the projections 54 of the insulator body and thus firmly hold the same. In assembling it is understood that the interrupted portions 56 of the insulator body will align with the jaws 62. By giving the body a fraction of a turn, a 30'd'egree angular movement in the case illustrated, theprojections will be brought into cooperative relationship with the jaws whereupon the ring 68 may bescrewed down to hold the parts in assembled. position. The base member 64 of Fig. 3 includes a bolting flange 70 having a number of bolt holes formed therein as shown by means of which it can be anchored to any suitable support.

In Fig. 6 I have shown a slight modification of the design shown in Fig. 3 wherein the jaws extend downwardly as shown at 72 and in which the base member 74 is provided with a recessed portion 76 within which is located a threaded ring 78 adapted to compress the jaw 72 against the fluted exterior parts of the lower portion of the insulator body 52.

In the construction of Figs. 1, and 2, it is noted that the jaws surround substantially the entire periphery of the lower part of the insulator and each. jaw moves inwardly as it comes into play when the clamping ring is forced down. On the other hand in the construction of Figs. 3 and 6 when the clamp rings 68 and 78 are screwed down the jaws being mtegral with the base members yield slightly and are thus pressed into engagement with the insulator body.

While I have described with great partici1- larity the details of the embodiments of the invention herein illustrated it is not to be construed that I am limited thereto since various modifications may be made by those skilled in the art without departing from the invention as defined in the appended claims.

I claim 1. The combination withanv insulator having a substantially cylindrical shank with a plurality of exterior corrugations of holdin means including a plurality of jaws adapte to engage said corrugated shank, said aws having a tapered exterior, a rin having a tapered bore coating with sai bolts adapted to force the ring in engagement with'said jaws.

2. The combination with an insulator having a substantially cylindrical corrugated shank of holding means including a plurality of jaws shaped for interengagement with said corrugated shank and a ring with a tapered bore for forcing said jaws toward said shank, and bolts for securing said ring to a support, said jaws having tapered faces for coaction with the tapered bore of said rmg.

3. The combination with an insulator having a substantially cylindrical corrugated shank of holding means including a plurality of jaws fluted for interengagement with said shank, said jaws each having a tapered exterior and a ring having a coacting tapered portion for engagement with said jaws and means holding the ring firmly in engagement with said aws. A

In witness whereof, I have hereunto signed my name. a

SEVERN D. SPRONG.

jaws and- 

